ANSYS求解时出现问题？感谢？
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*** Error beam 1 has zero area
Warning Massless nodes
The following massless nodes were found
Warning total number of massless nodes = 275
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(1)默认 最新
*** Error beam 1 has zero area
Warning Massless nodes
The following massless nodes were found
Warning total number of massless nodes = 275
你没有定义质量节点，也就是说，你没有定义集中质量单元mass21。